Shoulder chair



FIG. 1 is a front elevational view illustrating my design for a shoulder chair;

FIG. 2 is a left side view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for shoulder chair, as shown and described. 